<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script src="bundle.js"></script>
</head>
<body>
<div id="box" class="box">
    <input type="button" value="选项卡1" classs="btn">
    <input type="button" value="选项卡2">
    <input type="button" value="选项卡3">
    <div style="display:block;">这是第一个选项卡</div>
    <div>这是第二个选项卡</div>
    <div>这是第三个选项卡</div>
</div>
</body>
</html>